Scaling in the kinetics of the order-disorder transition inNi3Mn

Abstract

The kinetics of the atomic ordering in ${\mathrm{Ni}}_3$Mn has been investigated by time-resolved neutron-diffraction techniques. The results obtained show that dynamical scaling holds in the ordering process. The characteristic length grows consistently according to a power law. In addition, the growth exponent indicates a crossover, which can be attributed to the transition from coalescence of the ordered regions to migration of the domain walls. The scaling function for the structure factor is obtained and compared with the results of theories and computer simulations.